Victoria Annulus, Discusions about Victoria's Apron |
Victoria Annulus, Discusions about Victoria's Apron |
Aug 9 2006, 01:41 AM
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
From today, Oppy will start to head toward the Victoria Crater which is about 500 meters away. The drive would take about one month (that is 15 soles of driven with an average of 33 meters/sol, the other 15 soles would be for other purposes or restrictive soles).
The surface around Victoria Annulus, I seems it won't be as smooth as the way between Eagle and Endurance craters but the surface would have no uniform or parallel wave of sand and dust in small size of ripple. See Phil's Victoria Annulus partial map, Tesheiner's one Victoria Crater picture Otherwise, the surface might have ripples smaller and alike to the ones of El Dorado, on the skirt south side of Columbia Hill. Besides, the Anuulus has no outcrops except to around of few small mini-craters. This is a change of morphology of surface around the Victoria Annulus. What does it explain about this developing kind of surface of sand? Its extension is just around the inside of Victoria's ray of ejection. That is coincidence. Around that has no bigger ripples as the outside of Annulus. The explanation would be that around annulus has smoother rock or outcrop surface, no blocks which had not helped to build ripples by the winds. Other factor, I am not sure, is that the slope from the border of Annulus to crater is positive (going up by few meters), then this might be another factor not to build ripples. I have seen that anywhere in the desert that have a slopes does not have any ripples but only flat surface. Any debate about why the Victoria Annulus does not look like ripples as the outside of Annulus. Rodolfo |
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Sep 10 2006, 06:31 AM
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
I've gone over all of the recent MIs and I can't find anything I'd call a tektite. If someone would post a picture identifying one of the suspected critters, I'd appreciate it.
Regarding that berry with the central hole, it's not the first one we've seen on this long trek. That one seems to be one of the occasional concretions that we've come across that has been cleaved in half and abraded. I would interpret the hole as the place where the concretion's center was more friable, so the material was easily eroded away. That is not an uncommon phenomenon in earthbound concretions. The one with the dimple might be the same thing as the first. The third hole identified is in a clast (fragment) that doesn't resemble a concretion at all. There seems to be several sub-populations of fragments of different origins on the surface here. Among those that are not obviously concretions, some have noticeable porosity. But I must admit that the MI posted by SacramentoBob showing three different, tiny clasts with neat round holes is intriguing. ...just thinking out loud here... I wish I could tie them all together with a pretty pretty pink ribbon, but I can't. -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Sep 11 2006, 01:45 AM
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
I've gone over all of the recent MIs and I can't find anything I'd call a tektite. If someone would post a picture identifying one of the suspected critters, I'd appreciate it. I don't know if I'd call them tektites, exactly, but I think the larger rounded bodies in these soils, which tend to have randrop or conical shapes, might well be droplets of impact melt. That would make them similar to tektites in origin and general configuration. But tektites are often formed in the initial blast, from materials near the surface, and are blown a considerable distance away from the impact site. These droplets, if they're impact melt, came from less than 200 meters away. So they were formed later in the impact process (and hence probably contain materials from deeper within the excavation), and were ejected far less energetically than the more far-flung ejecta. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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